Mark James Handfield, 21, a Navy enlisted man from Kensington who was assigned to a nuclear submarine, was fatally injured Jan. 2 in an automobile accident in Honolulu, Hawaii.

Honolulu police said Mr. Handfield, a third class petty officer, suffered extensive head injuries when the car he was driving ran out of control and struck a parked flatbed truck. He died Jan. 3 at Tripler Army Hospital Center, police said.

Mr. Handfield was born in Philadelphia. He moved to Kensington with his family when he was 11 years old and graduated in 1975 from Albert Einstein High School there. He worked as an automobile mechanic before enlisting in the Navy in 1977.

He had been based at Pearl Harbor for about a year and was a fire control specialist aboard the nuclear submarine Patrick Henry at the time of his death.

Mr. Handfield had been a member of Holy Redeemer Catholic Church in Kensington.

Survivors include his parents, William G. and Therese Marie Handifield, of the home in Kensington; three sisters, Margaret, also of the home, Victoria, of Philadelphia, and Joanne, of Lynchburg, Va.; a grandmother, Therese Kinsey, of the home, and a grandfather, George Handfield, of East Greenwich, R. I.